aa06a9bd85
clock_gettime(CLOCK_MONOTONIC, &tp) is very precise on ia64 as it uses ITC (similar to rdtsc on x86). It's not quite a hrtimer as it is a few times slower than 1ns. Usually 2-3ns. clock_getres(CLOCK_MONOTONIC, &res) never reflected that fact and reported 0.04s precision (1/HZ value). In https://bugs.gentoo.org/596382 gstreamer's test suite failed loudly when it noticed precision discrepancy. Before the change: clock_getres(CLOCK_MONOTONIC, &res) reported 250Hz precision. After the change: clock_getres(CLOCK_MONOTONIC, &res) reports ITC (400Mhz) precision. The patch is based on matoro's fix. I added a bit of explanation why we need to special-case arch-specific clock_getres(). [akpm@linux-foundation.org: coding-style cleanups] Link: https://lkml.kernel.org/r/20220820181813.2275195-1-slyich@gmail.com Signed-off-by: Sergei Trofimovich <slyich@gmail.com> Cc: matoro <matoro_mailinglist_kernel@matoro.tk> Cc: Émeric Maschino <emeric.maschino@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
|---|---|---|
| .. | ||
| configs | ||
| hp/common | ||
| include | ||
| kernel | ||
| lib | ||
| mm | ||
| pci | ||
| scripts | ||
| uv | ||
| install.sh | ||
| Kbuild | ||
| Kconfig | ||
| Kconfig.debug | ||
| Makefile | ||